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Configure time synchronization#

Configure all containers in an MKE cluster to regularly synchronize with a Network Time Protocol (NTP) server, to ensure consistency between all containers in the cluster and to circumvent unexpected behavior that can lead to poor performance.

  1. Install NTP on every machine in your cluster:

    sudo apt-get update && sudo apt-get install ntp ntpdate

    sudo yum install ntp ntpdate
sudo systemctl start ntpd
sudo systemctl enable ntpd
sudo systemctl status ntpd
sudo ntpdate -u -s 0.centos.pool.ntp.org
sudo systemctl restart ntpd

    sudo zypper ref && zypper install ntp

    In addition to installing NTP, the command sequence starts ntpd, a daemon that periodically syncs the machine clock to a central server.

  2. Sync the machine clocks:

    sudo ntpdate pool.ntp.org

  3. Verify that the time of each machine is in sync with the NTP servers:

    sudo ntpq -p

    Example output, which illustrates how much the machine clock is out of sync with the NTP servers:

         remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 45.35.50.61     139.78.97.128    2 u   24   64    1   60.391  4623378   0.004
 time-a.timefreq .ACTS.           1 u   23   64    1   51.849  4623377   0.004
 helium.constant 128.59.0.245     2 u   22   64    1   71.946  4623379   0.004
 tock.usshc.com  .GPS.            1 u   21   64    1   59.576  4623379   0.004
 golem.canonical 17.253.34.253    2 u   20   64    1  145.356  4623378   0.004